import Vue from 'vue';

Vue.directive('dialogDrag', {
    bind(el, binding, vnode, oldVnode) {
        const dialogHeaderEl = el.querySelector('.el-dialog__header');
        const dragDom = el.querySelector('.el-dialog');
        dialogHeaderEl.style.cursor = 'move';

        // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
        const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);

        dialogHeaderEl.onmousedown = (e) => {
            // 鼠标按下，计算当前元素距离可视区的距离
            const disX = e.clientX - dialogHeaderEl.offsetLeft;
            const disY = e.clientY - dialogHeaderEl.offsetTop;

            // 获取到的值带px 正则匹配替换
            let styL, styT;

            // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
            if (sty.left.includes('%')) {
                styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);
                styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);
            } else {
                styL = +sty.left.replace(/\px/g, '');
                styT = +sty.top.replace(/\px/g, '');
            }
            ;

            document.onmousemove = function (e) {
                // 通过事件委托，计算移动的距离
                const l = e.clientX - disX;
                const t = e.clientY - disY;

                // 移动当前元素
                dragDom.style.left = `${l + styL}px`;
                dragDom.style.top = `${t + styT}px`;

                //将此时的位置传出去
                //binding.value({x:e.pageX,y:e.pageY})
            };

            document.onmouseup = function (e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        }
    }
})

// v-dialogDragWidth: 弹窗宽度拖大 拖小
Vue.directive('dialogDragWidth', {
    bind(el, binding, vnode, oldVnode) {
        const dragDom = binding.value.$el.querySelector('.el-dialog');

        el.onmousedown = (e) => {

            // 鼠标按下，计算当前元素距离可视区的距离
            const disX = e.clientX - el.offsetLeft;

            document.onmousemove = function (e) {
                e.preventDefault(); // 移动时禁用默认事件

                // 通过事件委托，计算移动的距离
                const l = e.clientX - disX;
                dragDom.style.width = `${l}px`;
            };

            document.onmouseup = function (e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        }
    }
})

Vue.directive('dragDiv',//自定义指令                                      JS
    {
        bind: function (el, binding) {
            let oDiv = el;   //当前元素
            let self = this;  //上下文
            oDiv.onmousedown = function (e) {
                //鼠标按下，计算当前元素距离可视区的距离
                let disX = e.clientX - oDiv.offsetLeft;
                let disY = e.clientY - oDiv.offsetTop;

                document.onmousemove = function (e) {
                    //通过事件委托，计算移动的距离
                    let l = e.clientX - disX;
                    let t = e.clientY - disY;
                    //移动当前元素
                    oDiv.style.left = l + 'px';
                    oDiv.style.top = t + 'px';
                    //将此时的位置传出去
                    binding.value({x: e.pageX, y: e.pageY})
                };
                document.onmouseup = function (e) {
                    document.onmousemove = null;
                    document.onmouseup = null;
                };
            };
        }
    }
)
